Top/bottom pincushion correction circuit with automatic picture

Details Top/bottom pincushion correction circuit with automatic picture Top/bottom pincushion correction circuit with automatic picture

1987-06-26

1988-08-16

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315371, H01J 2956

Patent

active

047647094

ABSTRACT:
A top/bottom pincushion correction circuit includes a multiplier having a gain control input coupled to a differential amplifier, one input of which is a ground potential and the other of which has a voltage dependent upon the B+ voltage supplied to the horizontal deflection system. A voltage divider is connected between the B+ voltage and a zener diode that provide a reference potential. Changes in B+ voltage are indicative of changes in the horizontal raster size and result in a compensating current being supplied to the gain control input of the multiplier which develops a corresponding change in pincushion correction signal amplitude.

REFERENCES:
patent: 4335333 (1982-06-01), Ramsay et al.
patent: 4496882 (1985-01-01), Oliver et al.

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